How to change the battery

@jaldana since iFixit does not yet have a specific guide for that, use the one from here It was written in Spanish so if needed, use a browser that does the translation for you. Replacement batteries are readily available at plenty of online stores.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!